In the coming hours, the weather trend points downward, a cold front brings rain and cooling. In the south and east, large amounts of precipitation accumulate until Saturday. Saturday will still be changeable, then the signs point to Indian summer!
Friday evening balance
The grinding cold front is currently still bringing further downpours to the very east of the country, or some snow from around 2000 to 2200 meters(compare the current radar image). With correspondingly high intensities, there are also a few flakes further down.
Fig. 1: Sugar-coated bear country in Arosa at around 2000 meters; Source: Roundshot
Since this morning's update, there have been further rain showers in the south, especially in the morning, some of them intense. The hit list with the largest amounts of precipitation since Thursday continues to be headed by Mosogno. In addition, there are a handful of stations in the canton of Ticino with rainfall totals of over 100 mm.
Precipitation amount (as of 16:40)
|Measuring stations||Precipitation amount (in mm)|
|Mosogno (771 a.s.l., TI)||243|
|Cevio (416 a.s.l., TI)||129|
|Comprovasco (575 a.s.l., TI)||129|
|Biasca (307 a.s.l., TI)||127|
|Robiei (1898 a.s.l., TI)||119|
|Faido (747 a.s.l., TI)||118|
|Torricella - Crana (1002 a.s.l., TI)||103|
|San Bernardino (1639 a.s.l., GR)||102|
|Elm (958 a.s.l., GL)||93|
|Piotta (1007 a.s.l., TI)||93|
|Locarno-Magadino (203 a.s.l., TI)||90|
|Trun (834 a.s.l., GR)||83|
|Airolo (1139 a.s.l., TI)||80|
|Vaduz (460 a.s.l.)||80|
|Zervreila (1738 a.s.l., GR)||77|
|Berninapass (2328 a.s.l., GR)||77|
|Sax (436 a.s.l., SG)||76|
|Cimetta (1672 a.s.l., TI)||75|
|Schaan (444 a.s.l.)||74|
|Locarno-Monti (367 a.s.l., TI)||73|
Behind the cold front, the sun was able to come out more and more this afternoon. Together with the existing moisture, however, more and more spring clouds are now forming, so that in the further course of the evening, occasional passing downpours and locally possibly the one or other lightning can be expected.
In the south and east much rain
As announced in yesterday's MeteoBlog (see below), an active cold front has crossed us last night. While it will temporarily dry out in the midlands in the coming hours, it continues to rain in the south and east, partly heavily(click here for the current radar). The snow line is currently between 2400 and 2800 meters (depending on intensity and region) and will drop to just under 2000 meters in places by the evening. Since Thursday morning, especially in Ticino, partly considerable amounts of precipitation have accumulated. The most rain has been measured so far in Mosogno with 182 mm (as of 8 am). Also close to triple digits are the rain totals in Robiei and Cevio. A large part of this precipitation fell early today, Friday, as the map below illustrates.
Precipitation amount (as of 08:00)
|Measuring stations||Precipitation amount (in mm)|
|Mosogno (771 a.s.l., TI)||182|
|Robiei (1898 a.s.l., TI)||101|
|Cevio (416 a.s.l., TI)||100|
|Faido (747 a.s.l., TI)||95|
|Torricella - Crana (1002 a.s.l., TI)||88|
|Piotta (1007 a.s.l., TI)||76|
|Biasca (307 a.s.l., TI)||75|
|Comprovasco (575 a.s.l., TI)||71|
|San Bernardino (1639 a.s.l., GR)||68|
|Airolo (1139 a.s.l., TI)||68|
|Cimetta (1672 a.s.l., TI)||67|
|Locarno-Monti (367 a.s.l., TI)||65|
|Bosco/Gurin (1486 a.s.l., TI)||59|
|Elm (958 a.s.l., GL)||54|
|Locarno-Magadino (203 a.s.l., TI)||54|
|Trun (834 a.s.l., GR)||50|
|Berninapass (2328 a.s.l., GR)||43|
|Mustér (1190 a.s.l., GR)||40|
|Säntis (2502 a.s.l., AR)||40|
|Braunwald (1299 a.s.l., GL)||38|
Apart from Ticino, the precipitation focus was in a strip from the Surselva over the Glarus Alps to the Alpstein.
Fig. 1: Rain since midnight; Source: MeteoNews
During the course of the day, the weather will temporarily calm down on the Central Plateau. During the day, we can expect sunny weather in the lowlands, but the sunshine will cause the formation of new shower cells. Towards evening, it should become wet again in many places. In the south and eastern parts of the country, it will remain mostly cloudy, with the precipitation focus in the morning. The following map shows the additional rain totals forecast for today (7 a.m. to midnight).
Fig. 2: Additional expected precipitation totals today; Source: MeteoNews
In the north still foehn, in the south already rain
From France, a cold front is already approaching Switzerland, but on the northern side of the Alps, the Föhn still has its fingers in the pie today and braces itself against the upcoming weather deterioration. This afternoon, the Föhn will increase in the Alps and reach its peak shortly before the arrival of the front. With a variable mixture of clouds and sun, 23 to 24 degrees will be reached, in the Föhn valleys it will be 25 to 27 degrees. The zero degree limit lies at 3600 to 4000 meters. In the evening, the aforementioned cold front reaches the Jura with first showers and embedded thunderstorms, subsequently moving further eastward. The Föhn in the Alps breaks down. In the south, the humid air is already accumulating. Here, rain continues in the afternoon, intensifying during the night.
Large amounts of rain in the south and east
After an often cloudy and wet night, Friday will already start dry in the west. This is not the case in Ticino, Grisons and central and eastern Switzerland. Out of the night it will continue to rain heavily, especially in the south there may also be thunderstorms. From here, the lines of showers embedded in the southwesterly flow will spread to Surselva, Rheinwald, Glarnerland and Alpenstein. The morning more or less falls into the water. Around noon and in the early afternoon, precipitation will temporarily decrease, later followed by a second push. The center of gravity slowly shifts eastward. In the night to Saturday, the intensities decrease. From Thursday to Saturday morning, widespread 100 to 150 mm of rain will fall in Ticino , locally up to 200 mm are conceivable. The largest amounts will occur between Locarnese, Maggia and Verzasca val leys as well as Leventina and Blenio valley. A second focus lies between Misox, Val San Giacomo and Splügen. In the regions bordering to the north, 60 to 100 mm fell, locally sometimes somewhat more. As a result, stream and river levels will swell, and the Rhine in the St. Gallen Rhine Valley is likely to reach flood levels due to runoff from Graubünden. There is a risk of landslides and mudflows. The snow line is in the range of 2500 meters in the north, up to 3000 meters in the south.
Fig. 1: 48-hour precipitation totals through Saturday, September 23 06 a.m. UTC ; Source: MeteoNews, Ubimet
Fig. 2: Large amounts of rain in the south and east until Saturday morning ; Source: MeteoNews
In the north changeable, in the southern valleys emerging north foehn.
Saturday will still be changeable in the north with subdued temperatures, the 20-degree mark remains out of reach. In French-speaking Switzerland, northwestern Switzerland, and a large part of the midlands, we can expect a changeable, but not unfriendly mix of sun and clouds. There will be only isolated splashes of rain and long dry spells. On the other hand, clouds will clearly dominate the central and eastern northern slopes of the Alps. Especially in the morning and around noon, there are still more frequent rain showers, but they will diminish in the course of the afternoon and evening. It is a kind of transition day, the air pressure is already gradually rising. In the south, there are still residual clouds in the morning and sometimes last showers, then the weather improves. In the valleys, an emerging northerly foehn makes itself felt, it becomes stronger and stronger until the evening.
Fig. 3: Outlook for the coming days; Source: MeteoNews
Indian summer takes a run-up
The following night, the weather calms down. Sunday will start with high foggy clouds, especially along the foothills of the Alps and in many valleys, but even these will make way for more and more sun during the day. Apart from that, there will be plenty of sunshine and blue skies. After a cool morning, temperatures continue to struggle with the 20-degree mark in the afternoon, reaching it only locally. On the mountains, however, temperatures are already rising significantly. In the south, it is still foehny and with up to 25 degrees late summer warm. From Monday to Wednesday, the ever-popular Indian summer will spread in our region. In the first half of the day, there will be a few fog or deep high fog patches in the lowlands, but these will clear by noon at the latest. Apart from that, we can look forward to bright sunshine. The temperature curve points upward, the zero degree limit lies partly on clearly over 4000 meters – on Monday even on 4500 to 4600 meters. Super excursion, mountain and hiking weather is setting in!
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